Some of the fuel/temperature gauges fail and read maximum at all times. Our technicians tell us that there is a gauge cluster replacement that includes the little voltage regulator as well.Google+
Car Problem Reports
Toyota Corolla Fuel/temperature gauges may fail or read maximum at all times
Toyota Corolla Problem
Average Mileage: 178,500 mi (122,000 mi - 268,000 mi)
Fuel & Temp Gauge both slide to MAX when ignition turned on. Problem began simultaneously on both gauges. Fuel will drop of max as tank nears empty.
Visitor, 1992 Toyota Corolla, 140,000 mi
Temperature gauge shoots all the way up after ignition.
Old timer mechanic can't fix it too.
Visitor, 1992 Toyota Corolla, 184,000 mi
Same problem, don't know the solution